One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,8)(3,7,11,15)(4,9,12,14)(5,10,13,16)(17,18,23,24)(19,21,20,25)(22,30,31,26)(27,32,28,29)(33,34,38,41)(35,39,45,48)(36,40,46,37)(42,43,44,47)(1,3)(2,7)(4,5)(6,11)(8,15)(9,10)(12,13)(14,16)(18,24)(21,25)(26,30)(29,32)(33,35)(34,39)(36,44)(37,43)(38,45)(40,47)(41,48)(42,46) involution — undirected(2,8)(3,11)(5,13)(9,14)(17,19,23,20)(18,25,24,21)(22,28,31,27)(26,29,30,32)(33,36,38,46)(34,40,41,37)(35,42,45,44)(39,43,48,47)(1,4)(2,9)(3,5)(6,12)(7,10)(8,14)(11,13)(15,16)(17,20,23,19)(18,21,24,25)(22,28,31,27)(26,29,30,32)(33,37)(34,36)(35,43)(38,40)(39,44)(41,46)(42,48)(45,47)(1,5)(2,10)(3,12)(4,11)(6,13)(7,14)(8,16)(9,15)(17,21)(18,20)(19,24)(22,29)(23,25)(26,28)(27,30)(31,32)(33,36)(34,40)(35,44)(37,41)(38,46)(39,47)(42,45)(43,48) involution — undirected(1,2)(3,7)(4,9)(5,10)(6,8)(11,15)(12,14)(13,16)(17,22,23,31)(18,26,24,30)(19,27,20,28)(21,29,25,32)(33,35)(34,39)(36,44)(37,43)(38,45)(40,47)(41,48)(42,46)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.