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