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