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