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