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)(17,18,22,26,23,19,21,25)(20,24,28,31,29,27,30,32)(17,19)(18,23)(20,27)(21,26)(22,25)(24,29)(28,32)(30,31) involution — undirected(1,3)(2,6)(4,10)(5,9)(7,13)(8,12)(11,15)(14,16)(17,20)(18,24)(19,27)(21,30)(22,28)(23,29)(25,32)(26,31) involution — undirected(3,9)(6,12)(10,15)(13,16)(17,21,23,22)(18,25,19,26)(20,28,29,30)(24,31,27,32)(17,21,23,22)(18,25,19,26)(20,28,29,30)(24,31,27,32)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.