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