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