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