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