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