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