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