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