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