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