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