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