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