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