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