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