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