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