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