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