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