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