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