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