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