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