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