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