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