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