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