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