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