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