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