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