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