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