One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(7,13)(8,15)(10,16)(12,18)(14,19)(17,20)(21,22)(23,32)(24,35)(25,29)(26,31)(27,30)(28,33)(34,36) involution — undirected(1,2,4,3)(5,6,9,11)(7,10,14,17)(8,12,15,18)(13,16,19,20)(21,23)(22,28)(24,27)(25,33)(26,34)(29,32)(30,36)(31,35)(5,7,8,13,9,14,15,19)(6,10,12,16,11,17,18,20)(21,24,26,33,25,34,27,23)(22,28,30,35,29,32,31,36)(1,3,4,2)(6,11)(10,17)(12,18)(16,20)(22,29)(23,33)(24,34)(30,31)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.