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