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