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