One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,6,11,9)(4,7,13,16)(10,14,12,15)(17,18,23,25)(19,29,30,24)(20,21,27,26)(22,32,31,28)(33,34)(35,44)(36,47)(37,45)(38,41)(39,43)(40,46)(42,48)(1,2)(3,6)(4,7)(5,8)(9,11)(10,14)(12,15)(13,16)(17,19)(18,24)(20,31)(21,32)(22,27)(23,30)(25,29)(26,28)(33,35)(34,40)(36,45)(37,41)(38,42)(39,46)(43,44)(47,48) involution — undirected(18,25)(19,30)(20,27)(28,32)(33,36,39,38)(34,41,43,47)(35,45,46,42)(37,44,48,40)(1,2)(3,9)(4,7)(5,8)(6,11)(10,15)(12,14)(13,16)(17,20,23,27)(18,26,25,21)(19,31,30,22)(24,28,29,32)(33,37,39,48)(34,42,43,45)(35,41,46,47)(36,40,38,44)(1,3,5,11)(2,6,8,9)(4,12,13,10)(7,15,16,14)(17,21,23,26)(18,27,25,20)(19,28,30,32)(22,24,31,29)(33,38,39,36)(34,41,43,47)(35,45,46,42)(37,40,48,44)(1,4,5,13)(2,7,8,16)(3,10,11,12)(6,14,9,15)(17,22,23,31)(18,28,25,32)(19,27,30,20)(21,24,26,29)(33,35)(34,40)(36,45)(37,41)(38,42)(39,46)(43,44)(47,48)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.