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