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