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