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