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