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