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