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