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