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