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