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)(19,23)(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)(9,10)(11,15)(12,14)(13,16)(17,19)(18,23)(20,29)(21,30)(22,28)(24,37)(25,35)(26,36)(27,34)(31,41)(32,43)(33,42)(38,46)(39,45)(40,47)(44,48) involution — undirected(9,11,12,16)(10,13,14,15)(18,24)(19,28)(20,31)(21,33)(23,34)(25,39)(26,27)(35,46)(36,37)(38,40)(43,48)(45,47)(1,2,5,4)(3,7,8,6)(11,16)(13,15)(17,20,22,31)(18,25,26,40)(19,29,28,41)(21,32,33,44)(23,35,36,47)(24,38,27,39)(30,43,42,48)(34,45,37,46)(1,4,5,2)(3,7,8,6)(10,14)(13,15)(18,26)(20,31)(23,36)(24,27)(29,41)(32,44)(34,37)(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.