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