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