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