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