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