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