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