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