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