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