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