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