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