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