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