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