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