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