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