One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(17,18,20,24,21,25,28,23)(19,22,27,31,26,30,32,29)(2,5)(6,8)(10,13)(11,15)(14,16)(17,19)(18,22)(20,27)(21,26)(23,29)(24,31)(25,30)(28,32) involution — undirected(9,10,12,14)(11,16,15,13)(18,23)(20,28)(22,29)(24,25)(27,32)(30,31)(1,3,4,7)(2,6,5,8)(10,14)(13,16)(19,26)(22,30)(27,32)(29,31)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.