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