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