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