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