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