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