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)(19,25)(20,23)(21,26)(22,32)(24,27)(28,30)(29,31) involution — undirected(1,3,5,4)(2,6,7,8)(17,19,23,29)(18,25,20,31)(21,22,30,24)(26,32,28,27)(10,13)(14,16)(17,20,23,18)(19,28,29,26)(21,31,30,25)(22,32,24,27)(9,11,12,15)(10,14,13,16)(17,21)(18,26)(19,22)(20,28)(23,30)(24,29)(25,32)(27,31)(1,4,5,3)(2,6,7,8)(17,22)(18,27)(20,32)(21,30)(23,24)(25,31)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.