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