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