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