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