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