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