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)(13,14,16,17)(15,19,20,18)(23,29)(24,31)(27,32)(28,33)(5,7)(6,11)(8,12)(9,10)(14,17)(18,19)(22,26)(27,32)(28,33)(34,36) involution — undirected(6,12)(7,9)(13,14,16,17)(15,19,20,18)(21,22)(23,27)(24,28)(25,26)(29,32)(30,34)(31,33)(35,36)(1,2,3,4)(5,8)(6,7)(9,12)(10,11)(13,14)(15,18)(16,17)(19,20)(21,23)(22,27)(24,30)(25,29)(26,32)(28,34)(31,35)(33,36)(5,9,10,7)(6,8,12,11)(13,15)(14,18)(16,20)(17,19)(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.