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